In low-reheating-temperature charged-parent freeze-in dark matter models, stronger couplings are viable if both dark matter and mediator number densities are tracked, with updated LHC and lepton-flavor-violation constraints.
A Fourth Exception in the Calculation of Relic Abundances
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abstract
We propose that the dark matter abundance is set by the decoupling of inelastic scattering instead of annihilations. This coscattering mechanism is generically realized if dark matter scatters against states of comparable mass from the thermal bath. Coscattering points to dark matter that is exponentially lighter than the weak scale and has a suppressed annihilation rate, avoiding stringent constraints from indirect detection. Dark matter upscatters into states whose late decays can lead to observable distortions to the blackbody spectrum of the cosmic microwave background.
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Singlet-doublet dark matter induces radiative neutrino masses at one loop while enabling TeV-scale leptogenesis in both Majorana and Dirac realizations.
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Freeze-in at all couplings
In low-reheating-temperature charged-parent freeze-in dark matter models, stronger couplings are viable if both dark matter and mediator number densities are tracked, with updated LHC and lepton-flavor-violation constraints.
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Singlet-doublet dark matter induced radiative neutrino mass and TeV scale leptogenesis
Singlet-doublet dark matter induces radiative neutrino masses at one loop while enabling TeV-scale leptogenesis in both Majorana and Dirac realizations.